Container Sealing Rim Spacing for Sink Mark Elimination
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Solution Overview
Problem
Existing container designs with sealing rims and skirts suffer from sink marks during injection molding, which impair the sealing effect of applied films due to the integration of webs or ribs, leading to incomplete sealing and potential lid detachment during transportation.
Innovation Solution
The container design separates the sealing function from the apron by positioning the sealing rim at a distance from the apron, eliminating webs or ribs that cause sink marks, allowing for a smooth surface for film application and ensuring a secure lid attachment through a spaced arrangement and clamping profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If webs or ribs are integrated into the sealing rim area to stabilize the apron, then structural strength is improved, but sink marks form during injection molding that impair sealing quality
Solution Approach 1:
The container structure is segmented into distinct functional zones: the sealing rim area is separated from the apron by a distance, allowing the sealing rim to be free of webs and ribs. This segmentation prevents sink marks in the sealing area while maintaining structural strength through properly positioned support elements in the apron region.
Solution Approach 2:
Different regions of the container are given different structural characteristics tailored to their specific functions. The sealing rim area is designed with a smooth, web-free surface optimized for sealing, while the apron region incorporates webs and ribs for structural support. This local differentiation ensures each area performs its intended function optimally.
2Device complexity
If the sealing rim is integrated with the apron, then device complexity is reduced, but the sealing effect is impaired due to sink marks
Solution Approach 1:
The container structure is segmented into distinct functional zones: the sealing rim area is separated from the apron by a distance, allowing the sealing rim to be free of webs and ribs. This segmentation prevents sink marks in the sealing area while maintaining structural strength through properly positioned support elements in the apron region.
3Manufacturing precision
If a smooth sealing surface is ensured by removing webs, then sealing quality is improved, but apron stability is reduced
Solution Approach 1:
The container structure is segmented into distinct functional zones: the sealing rim area is separated from the apron by a distance, allowing the sealing rim to be free of webs and ribs. This segmentation prevents sink marks in the sealing area while maintaining structural strength through properly positioned support elements in the apron region.
Solution Approach 2:
Different regions of the container are given different structural characteristics tailored to their specific functions. The sealing rim area is designed with a smooth, web-free surface optimized for sealing, while the apron region incorporates webs and ribs for structural support. This local differentiation ensures each area performs its intended function optimally.
Data Source
Figure 1a~1c
Figure 2a~2d
AI summary
The invention relates to a container (1) comprising: a circumferential side wall (3) on which, in the area of an opening (4) of the container (1), a circumferential container rim (5) is formed, projecting outwards and/or inwards beyond the side wall (3) and usable as a sealing rim, which has a top surface with a width of at least 2 mm for applying a film, in particular a peelable film, and a circumferential skirt (6) which has an engagement area for interacting with a lid, wherein a plurality of webs (16) are formed between the side wall (3), a circumferential outer edge of the skirt (6) and an upper edge of the skirt (6). The container rim (5) and the skirt (6) are arranged spaced apart from each other along the side wall (3) of the container (1). The invention also relates to a container with such a container (1) and with a lid that interacts with the circumferential engagement area of the container (1).